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Related Party Transactions - Other Purchases and Sales (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Due from related parties	$ 0		$ 0		$ 42,000
Secured term note payable - related party	$ 1,077,000		$ 1,077,000		1,077,000
Applied Cryo Technologies
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	51.00%	51.00%	51.00%	51.00%
Payment for equipment repairs and services	$ 132,000	$ 40,000	$ 498,000	$ 73,000
Affiliated Entity
Related Party Transaction [Line Items]
Purchases from related parties	35,000	10,000	78,000	20,000
Secured term note payable - related party	$ 32,000		$ 32,000		14,000
Affiliated Entity | TMG | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of beneficial ownership			25.00%
Affiliated Entity | Chart E&C
Related Party Transaction [Line Items]
Percentage of common stock owned	8.40%		8.40%
Affiliated Entity | Applied Cryo Technologies
Related Party Transaction [Line Items]
Related party sales	$ 0	0	$ 0	0
Due from related parties	0		0		2,000
Due to related parties	$ 72,000		$ 72,000		121,000
Affiliated Entity | TMG
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	25.00%		25.00%
Due from related parties	$ 0		$ 0		0
Due to related parties	760,000		760,000		$ 582,000
Purchase of supplies and services	$ 191,000	$ 162,000	$ 721,000	$ 195,000

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